we haven't had anybody taking credit so far for this attack, but the pakistani taliban telling nbc that they deny responsibility for the attack in boston. the united states navy is sending an explosive ordinance team to boston to assist in some of the wreckage there to figure out wa this can about the forensics on this attack. throughout the country, we'll see increased security at major eventes and major data points. here in d.c., they have the emancipation day parade. officials here in washington said that parade will go forward, but it will be met with increased security, security that you can see and security they say that you cannot see. and within a couple of hours of the attacks yesterday, president barack obama addressed the nation from the white house. he told people that he would track down who was responsible for this. but he said to be careful not to jump to conclusions about who was behind this attack. >> we will find out who did this, we will find out why they did this. any responsible individuals, any responsible groups will feel the full weight of justice. >> and the pre